Chemistry Transition Elements MDCAT 2018
PMDC Verified Question 52 of 68
Ligands having two lone pair of electrons for donations to the central transition metal ions are known as
A
monodentate ligand
B
hexadentate ligand
C
bidentate ligand
D
polydentate ligand
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: bidentate ligand
Concept:

Ligands are classified by their "denticity"—the number of donor atoms they use to bind simultaneously to a central metal ion.

Solution:

  • A ligand that donates one lone pair is monodentate.


  • A ligand that donates two lone pairs (from two separate donor atoms on the same molecule) to the central metal is called a bidentate ligand.


  • Examples include ethylenediamine (en) and oxalate (\(C_2O_4^{2-}\)).


Why other options are incorrect:

  • Hexadentate: Donates six lone pairs (e.g., EDTA).


  • Polydentate: A general term for any ligand donating more than one pair, but "bidentate" is the specific, exact term for two.

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